Anybody have any ideas on how to focus the beam on a P 60 drop in? I like a really focused beam.
Using wf-502b but don’t want to confine comments to this model.
Do you mean focus like a laser type beam or focus to get rid of smooth reflector rings?
Can I turn it in to a laser? That might be cool
Want to have a narrow intense beam like the cree 7w 300, but more brightness.
I’ve used xpg and xpe with a blacked out reflector, matte black krylon paint, with this lens http://dx.com/p/glass-optics-for-flashlights-28mm-5297#.UxycHr3MYm8
With good results. This will project the die image like a zoomed light. I haven’t tried with a highly driven xml but it will throw a tight beam.
I have it in a solarforce l2p host with the bezel from an l2t head. The bezel extends past the aspheric so it can stand on its head.
Wow that really would be a laser. I was looking at those lenses on eBay. So is the 28mm better or should I go for 35mm? Would rather have it sit in the flashlight attached. But my 502b isn’t here yet. Hate to wait to order, til I see the size, but probably should…
Should of jumped on to the ahorten lens group buy. It’s an aspheric lens which suits most P60 hosts… It focuses the image of the die.
You can still get them direct from him but I’m not sure how the price will compare. Just search for Ahorton Aspheric.
Thank you. OK I found this:
There’s a video a bit down the page. Where do I get the spacer? Or more accurately, how do I find it? Might go with themore inexpensive one.
Ash (Ahorton) sells the spacer and the lens. I bought it all as a kit when I got mine. A black aluminium threaded piece and a plastic ring and the lens.
If you send him an email he is very helpful. Answered all my questions thoroughly when I bought one.
while it is “nuts and bolts” much easier to just BUY a lens to focus up a emitter sharply?? you can use ANY lens to accomplish this.
if you happen to have ANY device laying around that should be thrown out, that has lenses on it? i always salvage the “free” lenses. You cn find telescopes or old gun scopes broken for free, or almost free. (I seem to get the most useful lenses out of old gun scopes)
i mean, if you have more time than money, or are just interested in the hobby… its a lot of fun. I mean, i’d still BUY the ahorton drop in?? but, dont be afraid to “play” on the side.
Yeah good point I think most any lens would focus it. As long as it has a positive focal length. Was holding a 50mm ish double convex (normal looking) lens and it seems tofocus the emitter. But its about 50mm/2in. from led. The flashlight ones are much shorter focal length it looks like.
I got 5 for $7on eBay, 28mm. Have to play with them. Probably get an AHorton if I can’t get it attached well. I saw $55 or something got worried but I think that they are like $7 now.
usually, the first lens i grab up, with about any visible light? is the “eyepiece” i unscrew out of just about any old gun scope.
by the by… if you are aiming a focused emitter up to test a lens? the “focal length” is actually quite variable. if you measure the “estimated focal length” across the ROOM to focus up? its vastly different than focusing up at 50 or 100 yards out.
room = very long
50 yards, 100 yards = very noticably shorter
“infinity focus” is a little shorter yet
I made the newbie optics error of thinking the FL (focal length) was a certain distance… it isnt.
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what you measure a meter or two away across the room? is getting close to almost DOUBLE th actual focal length.
it doent matter to USE ONE, you just focus it up… but, if you want to BUY OE because you like THAT focal length of the one you played with, but want to buy one that “fits” better, maybe a different diameter in the same focal length?
there is a formula, where you enter your measured focal distance, and the distance to the wall or target… and it spits out the “actual” focal length… or? take apiece of white paper, and draw up an image of the full moon carefully? that will be a lot closer (infinity focus)
if your gettign 2 inches across the room, thats about 50mm or close enough… its probably more like 30mm or something like that if you wanted to order it…
draw up an image of a bright lamp across the ROOM, and compare it to drawing up an image of the full moon… you’ll see the difference in measurement.
I know you said P60 but if you really want a thrower, there is only a limited amount you can hope to achieve with such a small head.
in general, to get really good throw, you need a large diameter, deep reflector and a small emitter.
Whilst an XP-E in a smooth P60 will be pretty good, it will never compete with something like the budget Jacob A60 or others like it.
https://budgetlightforum.com/t/-/8063
Just FYI. 
well, yeah… reflectors seem to be like lenses, theres no replacement for displacement. lol.
OK I got my crude “optics bench”, a Lowes yard stick, dollar general ruler with mm, and cree 7w 300 with lens unscrewed and off.
About 54mm from lens to led, 60 in. to wall
So even 5ft away I only had to extend it a little.
1/focal length=1/image+ 1/object
So 1/f = 1/54+1/(60x25.4)
So about a 50mm lens. A shorter focal length like my 7w 300 will extend less. If you had a longer focal length, it would have to extend more. But you’d have to hold it the focal length from the lens at a mminimum. So you don’t want a 300mm generally.
With any sort of drawing, it is the distance to the drawing.